本文用能量法求解了绑结层合板和编织复合材料等3D复合材料中有纤维搭桥的圆形脱层屈曲问题。搭桥纤维被视为连续分布于脱层面上、可提供与脱层屈曲挠度成正比的恢复力的线性弹簧，根据脱层夹支边界条件以及脱层只能向一个方向挠曲的约束条件，导出了一个特征长度a0，当脱层半径a超出a0时，脱层屈曲将仅发主在r＜a0的子圆域之内，并不跨越整个脱层区域（r≤a）；当脱层半径a小于a0时，脱层屈曲将跨越整个脱层区域，并随着a的减小，脱层屈曲的临界载荷将逐渐提高。 In this paper, we solved the circular delamination buckling problem of fiber bridge in 3D composite materials such as tie-laminate and braided composites by energy method. Bridging fibers are considered to be continuously distributed on the delamination surface, providing a linear spring that is directly proportional to the delamination flexion deflection, derived from the debonding boundary conditions and delaminations that can only flex in one direction A characteristic length of a0, when the delamination radius a exceeds a0, the delamination buckling will only occur within the subdomain r